If Bass wants to stay here, he'll exercise his player option. If it's a good fit, the Celtics will be able to sign him to a long-term deal in 2013. If he decides to hit free agency this year, he might not get his wish to stay here (although he will get a nice deal from someone, and I wouldn't blame him.)
Also, regarding whether Boston is or isn't a great place to play: what do you expect Bass and Dooling to say? They are both potentially low-to-mid-level free agents next year. You can badmouth the city you're playing in if you know people are going to be lined up around the corner to offer you another contract, but otherwise you come off as selfish and conceited, and that's not a good thing if you're going to be the 4th-7th best player on whatever team you sign with.
I'm not saying that these guys are selfish and conceited. I'm just saying they're not idiots, and are going to say good things about their current situations, because to do otherwise would be stupid. So if they say "Boston is great" it might not mean "Boston is great."